chiefs linebacker jovan belcher. as we said, he killed his girlfriend and himself in that murder-suicide. now, just a few months ago we saw the suicide of football player junior seau, another linebacker. do you think this could be related to the game? >> it's a lot of stress that comes along with the nfl. it's hard to pinpoint if it was strictly just the football. obviously, he must have had some sort of issues back at home resulting in the situation with his girlfriend. he might have had a 3-month-old daughter as well, so the fact that he took his life into his own hands in this kind of fashion showed that he might have had some issues outside of football. it could have been stress from the game, but it might have been more of a personal issue than football itself. >> sanjay gupta has done a whole lot of work on the affect of concussions that are common in football. i'm just curious. do you think -- have you ever heard anything about him having a concussion and might that have played a role? >> not that i've been to